On Sun, 2009-03-08 at 19:34 -0500, Bjorn Buckwalter wrote:

Hi all,

What is your preferred method of parsing floating point numbers (from String to Float/Double)? Parsec it seems only does positive floats out of the box and PolyParse requires the float to be on scientific form (exponential). While I've worked around these shortcomings in the past I feel that I am reinventing the wheel as surely I am not the only to run into these limitations. How do you parse your floats? Can you recommend a parsing library that handles them solidly?

(For my current needs the formats accepted by "read" are sufficient, but I want reasonable error handling (Maybe or Either) instead of an exception on bad inputs.)

fmap fst . listToMaybe . reads jcc

If you're working with ByteStrings, http://hackage.haskell.org/cgi-bin/hackage-scripts/package/bytestring-lexing might help. Cheers, Dan On Sun, Mar 8, 2009 at 8:34 PM, Bjorn Buckwalter wrote:

Hi all,

What is your preferred method of parsing floating point numbers (from String to Float/Double)? Parsec it seems only does positive floats out of the box and PolyParse requires the float to be on scientific form (exponential). While I've worked around these shortcomings in the past I feel that I am reinventing the wheel as surely I am not the only to run into these limitations. How do you parse your floats? Can you recommend a parsing library that handles them solidly?

(For my current needs the formats accepted by "read" are sufficient, but I want reasonable error handling (Maybe or Either) instead of an exception on bad inputs.)

Thanks, Bjorn Buckwalter _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe